issue:
I have try sometimes to build the qwt, build it always give me a failed result， show that some library could not be found,
WHILE I can find them in Qt install directory, for example
Qt5OpenGL.dll exist in @C:\Qt\Qt5.1.1\5.1.1\mingw48_32\bin@

and the same with Qt5Svg.dll, Qt5PrintSupport.dll, Qt5Widgets.dll, Qt5Concurrent.dll, Qt5Gui.dll, Qt5Core.dll